summaryrefslogtreecommitdiffstats
path: root/contrib/btree_gist/btree_uuid.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:17:33 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:17:33 +0000
commit5e45211a64149b3c659b90ff2de6fa982a5a93ed (patch)
tree739caf8c461053357daa9f162bef34516c7bf452 /contrib/btree_gist/btree_uuid.c
parentInitial commit. (diff)
downloadpostgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.tar.xz
postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.zip
Adding upstream version 15.5.upstream/15.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'contrib/btree_gist/btree_uuid.c')
-rw-r--r--contrib/btree_gist/btree_uuid.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/contrib/btree_gist/btree_uuid.c b/contrib/btree_gist/btree_uuid.c
new file mode 100644
index 0000000..b818759
--- /dev/null
+++ b/contrib/btree_gist/btree_uuid.c
@@ -0,0 +1,235 @@
+/*
+ * contrib/btree_gist/btree_uuid.c
+ */
+#include "postgres.h"
+
+#include "btree_gist.h"
+#include "btree_utils_num.h"
+#include "port/pg_bswap.h"
+#include "utils/uuid.h"
+
+typedef struct
+{
+ pg_uuid_t lower,
+ upper;
+} uuidKEY;
+
+
+/*
+ * UUID ops
+ */
+PG_FUNCTION_INFO_V1(gbt_uuid_compress);
+PG_FUNCTION_INFO_V1(gbt_uuid_fetch);
+PG_FUNCTION_INFO_V1(gbt_uuid_union);
+PG_FUNCTION_INFO_V1(gbt_uuid_picksplit);
+PG_FUNCTION_INFO_V1(gbt_uuid_consistent);
+PG_FUNCTION_INFO_V1(gbt_uuid_penalty);
+PG_FUNCTION_INFO_V1(gbt_uuid_same);
+
+
+static int
+uuid_internal_cmp(const pg_uuid_t *arg1, const pg_uuid_t *arg2)
+{
+ return memcmp(arg1->data, arg2->data, UUID_LEN);
+}
+
+static bool
+gbt_uuidgt(const void *a, const void *b, FmgrInfo *flinfo)
+{
+ return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) > 0;
+}
+
+static bool
+gbt_uuidge(const void *a, const void *b, FmgrInfo *flinfo)
+{
+ return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) >= 0;
+}
+
+static bool
+gbt_uuideq(const void *a, const void *b, FmgrInfo *flinfo)
+{
+ return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) == 0;
+}
+
+static bool
+gbt_uuidle(const void *a, const void *b, FmgrInfo *flinfo)
+{
+ return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) <= 0;
+}
+
+static bool
+gbt_uuidlt(const void *a, const void *b, FmgrInfo *flinfo)
+{
+ return uuid_internal_cmp((const pg_uuid_t *) a, (const pg_uuid_t *) b) < 0;
+}
+
+static int
+gbt_uuidkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
+{
+ uuidKEY *ia = (uuidKEY *) (((const Nsrt *) a)->t);
+ uuidKEY *ib = (uuidKEY *) (((const Nsrt *) b)->t);
+ int res;
+
+ res = uuid_internal_cmp(&ia->lower, &ib->lower);
+ if (res == 0)
+ res = uuid_internal_cmp(&ia->upper, &ib->upper);
+ return res;
+}
+
+
+static const gbtree_ninfo tinfo =
+{
+ gbt_t_uuid,
+ UUID_LEN,
+ 32, /* sizeof(gbtreekey32) */
+ gbt_uuidgt,
+ gbt_uuidge,
+ gbt_uuideq,
+ gbt_uuidle,
+ gbt_uuidlt,
+ gbt_uuidkey_cmp,
+ NULL
+};
+
+
+/**************************************************
+ * uuid ops
+ **************************************************/
+
+
+Datum
+gbt_uuid_compress(PG_FUNCTION_ARGS)
+{
+ GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+ GISTENTRY *retval;
+
+ if (entry->leafkey)
+ {
+ char *r = (char *) palloc(2 * UUID_LEN);
+ pg_uuid_t *key = DatumGetUUIDP(entry->key);
+
+ retval = palloc(sizeof(GISTENTRY));
+
+ memcpy((void *) r, (void *) key, UUID_LEN);
+ memcpy((void *) (r + UUID_LEN), (void *) key, UUID_LEN);
+ gistentryinit(*retval, PointerGetDatum(r),
+ entry->rel, entry->page,
+ entry->offset, false);
+ }
+ else
+ retval = entry;
+
+ PG_RETURN_POINTER(retval);
+}
+
+Datum
+gbt_uuid_fetch(PG_FUNCTION_ARGS)
+{
+ GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+
+ PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
+}
+
+Datum
+gbt_uuid_consistent(PG_FUNCTION_ARGS)
+{
+ GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+ pg_uuid_t *query = PG_GETARG_UUID_P(1);
+ StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
+
+ /* Oid subtype = PG_GETARG_OID(3); */
+ bool *recheck = (bool *) PG_GETARG_POINTER(4);
+ uuidKEY *kkk = (uuidKEY *) DatumGetPointer(entry->key);
+ GBT_NUMKEY_R key;
+
+ /* All cases served by this function are exact */
+ *recheck = false;
+
+ key.lower = (GBT_NUMKEY *) &kkk->lower;
+ key.upper = (GBT_NUMKEY *) &kkk->upper;
+
+ PG_RETURN_BOOL(gbt_num_consistent(&key, (void *) query, &strategy,
+ GIST_LEAF(entry), &tinfo,
+ fcinfo->flinfo));
+}
+
+Datum
+gbt_uuid_union(PG_FUNCTION_ARGS)
+{
+ GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
+ void *out = palloc(sizeof(uuidKEY));
+
+ *(int *) PG_GETARG_POINTER(1) = sizeof(uuidKEY);
+ PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
+}
+
+/*
+ * Convert a uuid to a "double" value for estimating sizes of ranges.
+ */
+static double
+uuid_2_double(const pg_uuid_t *u)
+{
+ uint64 uu[2];
+ const double two64 = 18446744073709551616.0; /* 2^64 */
+
+ /* Source data may not be suitably aligned, so copy */
+ memcpy(uu, u->data, UUID_LEN);
+
+ /*
+ * uuid values should be considered as big-endian numbers, since that
+ * corresponds to how memcmp will compare them. On a little-endian
+ * machine, byte-swap each half so we can use native uint64 arithmetic.
+ */
+#ifndef WORDS_BIGENDIAN
+ uu[0] = pg_bswap64(uu[0]);
+ uu[1] = pg_bswap64(uu[1]);
+#endif
+
+ /*
+ * 2^128 is about 3.4e38, which in theory could exceed the range of
+ * "double" (POSIX only requires 1e37). To avoid any risk of overflow,
+ * put the decimal point between the two halves rather than treating the
+ * uuid value as a 128-bit integer.
+ */
+ return (double) uu[0] + (double) uu[1] / two64;
+}
+
+Datum
+gbt_uuid_penalty(PG_FUNCTION_ARGS)
+{
+ uuidKEY *origentry = (uuidKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
+ uuidKEY *newentry = (uuidKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
+ float *result = (float *) PG_GETARG_POINTER(2);
+ double olower,
+ oupper,
+ nlower,
+ nupper;
+
+ olower = uuid_2_double(&origentry->lower);
+ oupper = uuid_2_double(&origentry->upper);
+ nlower = uuid_2_double(&newentry->lower);
+ nupper = uuid_2_double(&newentry->upper);
+
+ penalty_num(result, olower, oupper, nlower, nupper);
+
+ PG_RETURN_POINTER(result);
+}
+
+Datum
+gbt_uuid_picksplit(PG_FUNCTION_ARGS)
+{
+ PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
+ (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
+ &tinfo, fcinfo->flinfo));
+}
+
+Datum
+gbt_uuid_same(PG_FUNCTION_ARGS)
+{
+ uuidKEY *b1 = (uuidKEY *) PG_GETARG_POINTER(0);
+ uuidKEY *b2 = (uuidKEY *) PG_GETARG_POINTER(1);
+ bool *result = (bool *) PG_GETARG_POINTER(2);
+
+ *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
+ PG_RETURN_POINTER(result);
+}